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/*
reads input data
Copyright (C) 1999 Martin Vogt
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Library General Public License as published by
the Free Software Foundation.
For more information look at the file COPYRIGHT in this package
*/
#include "bufferInputStream.h"
#include "simpleRingBuffer.h"
BufferInputStream::BufferInputStream(int size,int minlinSize,
const char* name) {
ringBuffer=new SimpleRingBuffer(size,minlinSize);
leof=false;
bytePos=0;
fillgrade=0;
setUrl(name);
lLock=false;
abs_thread_mutex_init(&writeInMut);
}
BufferInputStream::~BufferInputStream() {
delete ringBuffer;
abs_thread_mutex_destroy(&writeInMut);
}
int BufferInputStream::open(const char*) {
leof=false;
setBlocking(true);
return true;
}
void BufferInputStream::close() {
leof=true;
setBlocking(false);
}
int BufferInputStream::eof() {
return (leof && (fillgrade==0));
}
int BufferInputStream::isOpen() {
return !leof;
}
void BufferInputStream::setBlocking(int lblock) {
ringBuffer->setCanWaitForSpace(lblock);
ringBuffer->setCanWaitForData(lblock);
}
int BufferInputStream::getHold() {
return lLock;
}
void BufferInputStream::setHold(int lLock) {
if (lLock) {
lockBuffer();
} else {
unlockBuffer();
}
this->lLock=lLock;
}
int BufferInputStream::read(char* ptr,int size) {
int i=0;
int n=size;
int canCopy=n;
char* readPtr;
// here we read even if leof is true
// we make sure that we empty the whole buffer!
while((eof()==false) && (n > 0)) {
canCopy=n;
ringBuffer->getReadArea(readPtr,canCopy);
if (canCopy <= 0){
ringBuffer->waitForData(1);
continue;
}
if (n < canCopy) {
canCopy=n;
}
memcpy((char*)ptr+i,readPtr,canCopy);
i=i+canCopy;
n=n-canCopy;
ringBuffer->forwardReadPtr(canCopy);
ringBuffer->forwardLockPtr(canCopy);
lockBuffer();
bytePos+=canCopy;
fillgrade-=canCopy;
unlockBuffer();
}
return i;
}
int BufferInputStream::write(char* ptr,int len,TimeStamp* stamp) {
int i=0;
int n=len;
int canWrite=n;
char* writePtr;
if (stamp) {
lockBuffer();
long key;
key=bytePos+fillgrade;
InputStream::insertTimeStamp(stamp,key,len);
unlockBuffer();
}
// if eof is set we do not insert any more data
// we do not call eof() !!!
while((leof==false) && (n > 0)) {
canWrite=n;
ringBuffer->getWriteArea(writePtr,canWrite);
if (canWrite <= 0){
ringBuffer->waitForSpace(1);
continue;
}
if (canWrite > n) {
canWrite=n;
}
memcpy(writePtr,(char*)ptr+i,canWrite);
i=i+canWrite;
n=n-canWrite;
ringBuffer->forwardWritePtr(canWrite);
lockBuffer();
fillgrade+=canWrite;
unlockBuffer();
}
return i;
}
int BufferInputStream::write(InputStream* input,int len,TimeStamp* stamp) {
int i=0;
int n=len;
int canWrite=n;
int didWrite;
char* writePtr;
if (stamp) {
lockBuffer();
long key;
key=bytePos+fillgrade;
InputStream::insertTimeStamp(stamp,key,len);
unlockBuffer();
}
// if eof is set we do not insert any more data
// we do not call eof() !!!
while((leof==false) && (n > 0)) {
canWrite=n;
ringBuffer->getWriteArea(writePtr,canWrite);
if (canWrite <= 0){
ringBuffer->waitForSpace(1);
continue;
}
if (canWrite > n) {
canWrite=n;
}
didWrite=input->read(writePtr,canWrite);
if (input->eof()) break;
i=i+didWrite;
n=n-didWrite;
ringBuffer->forwardWritePtr(didWrite);
lockBuffer();
fillgrade+=canWrite;
unlockBuffer();
}
return i;
}
long BufferInputStream::getByteLength() {
return ringBuffer->getFillgrade();
}
int BufferInputStream::getFillgrade() {
return ringBuffer->getFillgrade();
}
int BufferInputStream::getFreeRead() {
return ringBuffer->getFreeRead();
}
int BufferInputStream::getFreeSpace() {
return ringBuffer->getFreeWrite();
}
long BufferInputStream::getBytePosition() {
return bytePos;
}
void BufferInputStream::setBytePosition(long bytePos) {
this->bytePos=bytePos;
}
int BufferInputStream::seek(long) {
return false;
}
void BufferInputStream::clear() {
ringBuffer->emptyBuffer();
ringBuffer->exitWaitForData();
ringBuffer->exitWaitForSpace();
timeStampArray->clear();
lockBuffer();
bytePos=0;
fillgrade=0;
unlockBuffer();
}
// remote read extension
int BufferInputStream::readRemote(char** ptr,int size) {
int n=0;
char* readPtr;
while((eof()==false)) {
n=size;
ringBuffer->getReadArea(readPtr,n);
if (n < size){
ringBuffer->waitForData(size);
if (ringBuffer->getCanWaitForData()==false) {
break;
}
continue;
}
break;
}
*ptr=readPtr;
return n;
}
void BufferInputStream::forwardReadPtr(int bytes) {
ringBuffer->forwardReadPtr(bytes);
ringBuffer->forwardLockPtr(bytes);
lockBuffer();
bytePos+=bytes;
fillgrade-=bytes;
unlockBuffer();
getTimeStamp(bytePos);
}
void BufferInputStream::setCanWaitForData(int lBlock) {
ringBuffer->setCanWaitForData(lBlock);
}
void BufferInputStream::lockBuffer() {
abs_thread_mutex_lock(&writeInMut);
}
void BufferInputStream::unlockBuffer() {
abs_thread_mutex_unlock(&writeInMut);
}
int BufferInputStream::getSize() {
return ringBuffer->getSize();
}
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